I am working with a group of scholars to implement the Old Italic block
of Unicode. For this purpose I have created a font to support the
Faliscan language. But I am getting unexpected behavior with the
stylistic sets.
The minimal example pasted at the end of this email gives the result
shown in OldItalicMinimal png. (Note: that example does compile on my
system, but won't work without the customized font. I will share the
font if anyone really wants it.) What's happening is that Stylistic Set
1 is being applied where it should not be. Note that in the code I used
curly braces to limit the effect of SS1 to only a few characters, a
procedure that normally works correctly. Yet SS1 is affecting the line
before it and the complete Old Italic sample alphabet below it.
There might be something wrong with the font, but if so I can't figure
out what it is. I carefully defined the stylistic sets as features for
Faliscan (whose code is XFA) only, not as part of default language under
the Old Italic script. This is shown in the OI_FontEditor attachment.
Everything works correctly in the font editor's preview window.
I may be calling fontspec incorrectly, there may be a problem with the
font, or xetex may be doing something weird. I'd appreciate any help in
sorting this out since I just can't figure out what's the cause.
* * * * * *
% !TEX TS-program = xelatex
% !TEX encoding = UTF-8
\documentclass[12pt]{article}
\usepackage{fontspec}
\usepackage{tabto} %to get absolute positions on a line
\setmainfont{Cardo}
\begin{document}
\noindent The first two lines should show the same shapes, while the
third line should show alternate glyphs applied via a stylistic set.
FaliscanCDS is the font I have constructed and am testing.\\
\tabto{.5in}𐌀𐌆𐌇𐌈𐌒𐌓𐌔𐌕𐌚 \tabto{1.75in}Cardo font as test for
default shapes\\
\newfontlanguage{Faliscan}{XFA} %declare the new language
\fontspec[Script=Old Italic,Language=Faliscan]{FaliscanCDS} %set the
font for Faliscan
\tabto{.5in}𐌀𐌆𐌇𐌈𐌒𐌓𐌔𐌕𐌚
\tabto{1.75in}{\fontspec{Cardo}FaliscanCDS with no stylistic set applied}\\
{\addfontfeature{StylisticSet=1}\tabto{.5in}𐌀𐌆𐌇𐌈𐌒𐌓𐌔𐌕𐌚 }
\tabto{1.75in}{\fontspec{Cardo}Faliscan CDS with Stylistic Set 1}\\
𐌀̣𐌁̣𐌂̣𐌃̣𐌄̣𐌅̣𐌆̣𐌇̣𐌈̣𐌉̣𐌊̣𐌋̣𐌌̣𐌍̣𐌎̣𐌏̣𐌐̣𐌑̣𐌒̣𐌓̣𐌔̣𐌕̣𐌖̣𐌗̣𐌘̣𐌙̣𐌚̣𐌛̣𐌜̣𐌝̣𐌞̣𐌟̣𐌠𐌡̣𐌢̣𐌣̣
\end{document}
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